Deprecated functions are no longer marked as deprecated in docs

[jrfnl]

Deprecated functions used to/are supposed to be marked with a "This .. is deprecated since ..., use ... instead" banner near the top of the documentation page.

This currently does not work.

Example: https://developer.wordpress.org/reference/functions/sticky_class/
Source: https://core.trac.wordpress.org/browser/tags/5.9/src/wp-includes/deprecated.php#L3149

[GaryJones]

Seems to be there now (albeit not with the since version number).

Since it's a display issue, it's probably better off in https://github.com/WordPress/wporg-developer/ as presumably there's at least some parsing happening correctly right now (not sure if since version is not parsed out correctly, in which case that would be an issue for this repo).